diff --git a/src/main.zig b/src/main.zig
index c40cc22..fef8da3 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -135,8 +135,9 @@ pub fn main(init: std.process.Init) !void {
     var arena = std.heap.ArenaAllocator.init(init.gpa);
     defer arena.deinit();
 
-    var sfb = std.heap.stackFallback(1 << 20, arena.allocator());
-    const allocator = sfb.get();
+    var bfa_buf: [1 << 20]u8 = undefined;
+    var bfa: std.heap.BufferFirstAllocator = .init(&bfa_buf, arena.allocator());
+    const allocator = bfa.allocator();
 
     const stdout_file = Io.File.stdout();
 
@@ -1031,11 +1032,19 @@ fn onCompletion(io: *ourio.Ring, task: ourio.Task) anyerror!void {
             const dir: Io.Dir = .{ .handle = fd };
 
             if (cmd.opts.useHyperlinks()) {
-                var proc_path_buf: [64]u8 = undefined;
-                const proc_path = try std.fmt.bufPrint(&proc_path_buf, "/proc/self/fd/{d}", .{fd});
                 var buf: [Io.Dir.max_path_bytes]u8 = undefined;
-                const n = try Io.Dir.readLinkAbsolute(cmd.std_io, proc_path, &buf);
-                cmd.current_directory = try cmd.arena.dupeZ(u8, buf[0..n]);
+                const resolved: []const u8 = if (builtin.os.tag == .macos) resolved: {
+                    // macOS has no /proc; use fcntl(F_GETPATH) to resolve the fd to a path.
+                    const rc = std.c.fcntl(fd, std.c.F.GETPATH, &buf);
+                    if (rc != 0) return error.FileNotFound;
+                    break :resolved std.mem.sliceTo(&buf, 0);
+                } else resolved: {
+                    var proc_path_buf: [64]u8 = undefined;
+                    const proc_path = try std.fmt.bufPrint(&proc_path_buf, "/proc/self/fd/{d}", .{fd});
+                    const n = try Io.Dir.readLinkAbsolute(cmd.std_io, proc_path, &buf);
+                    break :resolved buf[0..n];
+                };
+                cmd.current_directory = try cmd.arena.dupeZ(u8, resolved);
             }
 
             var temp_results: std.ArrayListUnmanaged(MinimalEntry) = .empty;